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      1 /*
      2  *  Copyright 2011 The LibYuv Project Authors. All rights reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 
     12 #include "libyuv/video_common.h"
     13 
     14 #ifdef __cplusplus
     15 namespace libyuv {
     16 extern "C" {
     17 #endif
     18 
     19 #define ARRAY_SIZE(x) (static_cast<int>((sizeof(x) / sizeof(x[0]))))
     20 
     21 struct FourCCAliasEntry {
     22   uint32 alias;
     23   uint32 canonical;
     24 };
     25 
     26 static const FourCCAliasEntry kFourCCAliases[] = {
     27   {FOURCC_IYUV, FOURCC_I420},
     28   {FOURCC_YU16, FOURCC_I422},
     29   {FOURCC_YU24, FOURCC_I444},
     30   {FOURCC_YUYV, FOURCC_YUY2},
     31   {FOURCC_YUVS, FOURCC_YUY2},
     32   {FOURCC_HDYC, FOURCC_UYVY},
     33   {FOURCC_2VUY, FOURCC_UYVY},
     34   {FOURCC_BA81, FOURCC_BGGR},
     35   {FOURCC_JPEG, FOURCC_MJPG},  // Note: JPEG has DHT while MJPG does not.
     36   {FOURCC_RGB3, FOURCC_RAW},
     37   {FOURCC_BGR3, FOURCC_24BG},
     38 };
     39 
     40 LIBYUV_API
     41 uint32 CanonicalFourCC(uint32 fourcc) {
     42   for (int i = 0; i < ARRAY_SIZE(kFourCCAliases); ++i) {
     43     if (kFourCCAliases[i].alias == fourcc) {
     44       return kFourCCAliases[i].canonical;
     45     }
     46   }
     47   // Not an alias, so return it as-is.
     48   return fourcc;
     49 }
     50 
     51 #ifdef __cplusplus
     52 }  // extern "C"
     53 }  // namespace libyuv
     54 #endif
     55 
     56